<h1>Test Cases</h1>
<p>Every testcase will be sent to the submissions and judged seperately.</p>
<p><b>Grade:</b> The grade for one testcase. If pass the test, student will get the grade. Otherwize, get zero. Sum of grades of all the testcases is the final grade.</p>
<p><b>Input:</b> The input data which will be sent to the stdin of submissions.</p>
<p><b>Output:</b> The output data which will be compared with the data from submissions' stdout to judge.</p>
<p><b>Feedback:</b> The message will be showed to the students who didn't pass the testcase. Useful if you want to give the student some hints or instructions.</p>
